When filling the path it should use the painter's pen not the state's

The state should already be updated when fillPath() is called, so it
should use the painter's pen to fill the path with instead as this will
have been updated already.

Task-number: QTBUG-39303
Change-Id: I1cc9922d4183bd44076c26210db06ad825ebf25b
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>